A book of First Class stamps valtrex 500 mg twice daily To make the photon stick together, the researchers took atoms of rubidium and put them into a vacuum chamber. They then fired laser beams at the rubidium to cool it within a hair of absolute zero, or about -460 degrees Fahrenheit. After that they fired another, weaker laser into the cloud. The second laser was so weak that only a single photon at a time went in.
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